This Educational Construction kit features an aerial tram which glides through the air along a stretched rope. When the slide bar on top of the tram makes contact with a stopper set on the rope, it moves a lever to change the direction of the worm gear, spring, and counter gear mechanism and causes the tram to make a return trip. The kit is easy to assemble and only involves snapping parts together and attaching a few screws. The tram itself is made from paper stock and may be finished in the colors of your choice. A 3m long piece of rope is conveniently included. 116mm x Width 73mm x Height 105mm. Type 130 Motor Included. 'Not included' (1) R6/AA/UM3 Alkaline Battery.